Ash removal device



June 17, 1952 MAR-UN ASH REMOVAL DEVICE INVENTOR. Jsef Movd'm BY /f Patented June 17, 1952 ASH REMOVAL` DEVICE Josefivlartin, Munich, Germany Application March 29, 195,1, Serial N o. 218,175 In Germany Decemberl, 1949y @claims (c1. 1ro-.165)

.l vlIlhe present inventionrelatQS-t a dflhifelll" removing ashesY from.. furnacesl and the like of the type`v in which the ashes are discharged into areceiver containing waterand having a reciprocatingjpusher plate-which., pushes the ashes 4.into anv inclinedadischarge conduit. l

Ash removal devices of this type operate satisfactorily with regard to cooling the ashes and preventing the entry of extraneous air into the furnace chamber and of dust into the room in which the furnace is located. They are not entirely satisfactory, however, in that during the return stroke of the pusher plate the ashes slide backwards in the discharge conduit for a substantial distance, especially when the bottom surfaces have become smooth and polished after a relatively short wearing-in period. With certain types of ashes such backsliding may amount to as much as one-half of the stroke of the pusher plate which not only reduces the efficiency of the device, i. e., its ash removal capacity, but also increases the extent of mechanical wear.

It is the object of this invention to provide an ash removal device in which backsliding in the discharge conduit is prevented and mechanical Wear of the surfaces in contact with the ashes is minimized.

The manner in which this object is achieved is shown in the appended drawings in which:

Fig. 1 is an elevational View of an ash removal device according to my invention, partly in cross section;

Fig. 2 is a fragmentary view, similar to Fig. l, showing a modification of my invention; n

Fig. 3 is another fragmentary View, similar to Fig.`2, showing another modification of my invention; and

Fig. 4 is a view. in cross section along line 4-4 of Fig. 1, showing an optional detail.

Like parts are designated by like numerals in all figures of the drawing.

Referring now to Fig. 1, the ash removal device embodying my invention comprises a receiver I which is provided with a sleeve Il and an inclined discharge conduit I3 having a bottom wall I4, side walls I5 and a top Wall I6. The receiver I0 has a curved bottom I2 from which the bottom wall I4 extends tangentially. On the curved bottom I2 is placed a wear plate which has its forward edge bent up so as to form a retaining ledge 2| resting on a plate 22 and facing upwardly in the discharge conduit I3. Within the receiver I0 and slidable on the wear plate 20 is a pusher plate 24 carried on an arm which is connected by a pivot 26 withv a crank 2,1 .mounted cn a shaft The shaft, lisadapted to be oscllatedbypnven: tiglialmeens. (netshown). so. as to. moi/.gibs pusher plate Ztarm '25, and, crank .21. had; and forth betweenl the positions lshown iny solid, a broken lines.

In operation, the receiver I0 is lled with water 23 and the shaft 28 is oscillated so as to reciprocate the pusher plate 2li. Ashes 29 dropping into the sleeve II from a grate (not shown) are cooled by the water 23 and fall on the wear plate 20 where they come into the path of the reciprocating pusher plate 24 which thus pushes the ashes into the discharge conduit I3. As the pusher plate 24 returns from the position shown in broken lines tc that shown in full lines, the ashes 29 in conduit I3 are prevented from sliding back by the resistance offered by the ledge 2|. The ashes 29 are thus moved step-wise through the discharge conduit I3, as indicated by the arrow.

The modification shown in Fig. 2 employs a plurality of plates 3S, 3|, 32 instead of a single plate 2'2, as in Fig. 1. Plate 30 has its forward edge overlapping plate 3|, forming a ledge 33. Plate 3| in turn has its forward edge overlapping plate 32, forming a ledge 34. The ledges 33 and 34 act, like ledge 2|, as retaining means to prevent backsliding of ashes during the return stroke of the pusher plate 2d. Any desired number of plates can, of course, be provided, adjacent plates overlapping each other in the reverse fashion of roof shingles, as shown.

In Fig. 3 there is provided a liner 40 which has integrally formed thereon a wear surface 4| and projections forming retaining ledges 42, 43, 44, and 45. The liner 40 may be made of cast iron or of a ceramic material.

Fig. 4 shows the sidewalls I5 of the discharge conduit I3 provided with retaining ledges 50 facing upwardly in the discharge conduit. This is an optional feature of my invention.

The number of retaining ledges to be provided in the discharge conduit for effectively stopping any backsliding of the ashes, and whether such ledges are placed on the bottom wall only, as shown in Figs. 1 to 3, or additionally on the side walls, as shown in Fig. 4, will depend on the degree of inclination of the discharge conduit as well as the character of the ashes and more particularly their tendency to slide back.

While I have shown and described what I consider the preferred embodiments of my invention, I wish it to be understood that I do not desire to be limited to the exact details of design and construction shown and described, for obvious modifications will occur to a person skilled in the art. Reference is, therefore, made to the appended claims for a definition of the scope of my invention.

I claim:

1. A device for removing ashes from furnaces comprising a receiver adapted to receive ashes, said receiver having a curved bottom, an upwardly inclined discharge conduit communicating with said receiver and having two side walls and a bottom wall extending tangentially from said curved bottom, a pusher plate reciprocally located on said curved bottom, means for reciprocating said pusher plate so as to push ashes from said receiver into said discharge conduit, and immovable ledge-shaped retaining means in said discharge conduit to keep ashes in said discharge conduit from sliding downwardly towards said receiver.

2. A device as defined in claim 1, said retaining means comprising a plurality of overlapping plates on said bottom wall placed in the reverse fashion of roof shingles, each of said plates having an edge forming a ledge facing upwardly in said discharge conduit.

CII

3. A device as dened in claim 1, said retaining means comprising plate means having a plurality of integral projections forming retaining ledges facing upwardly in said discharge conduit.

4. A device as defined in claim 1, including retaining ledges on both said side walls, said retaining ledges facing upwardly in said discharge conduit.

JOSEF MARTIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

